                              :sem head-sem})]
       {:phrasal true
        :synsem {:cat cat
-                :sem head-sem
                 :mod {:first comp-sem
                       :rest head-mod}
+                :sem head-sem
+                :slash false
                 :subcat '()}
        :head {:rule "noun-phrase2"
               :phrasal true

                unmodified
                root-is-head-root
                {:head {:phrasal true
                        :slash false}
                 :slash false
                 :rule "sentence-phrasal-head"
                 :synsem {:cat :verb}})
   
   (unify-check h21
                root-is-head
                {:rule "transitive-vp-nonphrasal-head"
                 :slash false
                 :synsem {:aux false
                          :cat :verb}})
   (unify-check h21
                root-is-head-root

                unmodified
                root-is-head
                {:rule "sentence-nonphrasal-head"
                 :synsem {:cat :verb
                          :slash false}
                 :head {:phrasal false
                        :slash false
                        :synsem {:participle false}}})
